std::acos

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Defined in header `<cmath>`

float acos( float arg );

double acos( double arg );

long double acos( long double arg );

Computes arc cosine of arg

arg

-

floating point value

arc sine of arg in radians in the range of [0; π] radians.

Domain error occurs if arg is outside the range [-1.0; 1.0]. NAN is returned in that case.


asin	computes arc sine ( $arcsin(x)$ ) (function)

atan	computes arc tangent ( $arctan(x)$ ) (function)

atan2	arc tangent, using signs to determine quadrants (function)

cos	computes cosine ( $cos(x)$ ) (function)

acos(std::complex) (C++11)	computes arc cosine of a complex number ( $arccos(z)$ ) (function template)

acos(std::valarray)	applies the function std::acos to each element of valarray (function template)